Development of Silicon Strip Detector for the measurement
of Ξ-atom X-raysHitoshi SugimuraKyoto University
(For E03 collaboration)
SNU Kiyoshi Tanida Ryuta Kiuchi Joo Chang Woo JAEA Ken’ichi Imai Hiroyuki Sako Susumu Sato KyotoU Hitoshi Sugimura Satoshi Adachi Hidemitsu Asano RCNP Tomoaki Hotta
Collaborators
J-PARC E03 experiment
Fe
K- K+
1.8GeV/cp
FeΞ-
X-ray
Ge-Detector
drrUrE )(|)(|2
Strong Interaction makes Energy Shift
We detect X-ray from Ξ-atom by using Ge-detector for the first time.Energy shift provides information of ΞN interaction.
Fe
Ξ-
J-PARC E03 experiment
Fe
K- K+
1.8GeV/cp
Fe
Ξ-
FeΞ-
X-ray
Ge-Detector
drrUrE )(|)(|2
Strong Interaction makes Energy Shift
1-step ,We detect X-ray by using Ge-detector.How to detect X-ray from xi atom is first challenge And 2-step make sure that how much energy shift. Make us information to ΞA interaction
Expected Energy Shift (Simulation)
Detector Set up
Target
SSD
SSD
SSD measures Ξ track and dE/dx to select slow Ξ so that better S/N ratio will be obtained for stopping Ξ.
K-
K+
KURAMA magnetHyperball-J
target
K-
Thickness ~300um
Effective area 6cmx6cm
Pitch 80um x 768 strips
Read out chip : APV25
128ch readout /1chip
Shaping time 50nsec
Serial Data Transfer
Radiation tolerance checked
up to 3x1014protons /cm2
At 108Hz beam, efficiency is
accomplished up to 96%
Silicon Strip Detector (SSD)
Time resolution and S/N
•Reconstruct pulse height by wave form analysis.
We have achieved SNR>10
MIP signalNoise level
S/N=
=17.0
•Reconstruct Hit Timing
If 107Hz beam , probability accidental hit is 13.6% Good enough to identify ghost tracks.
σ=3.61ns
σ=3.61ns
time
S/N
SSD has been developed for E03 which detect X-ray from Xi atom for the first time .
SSD has been tested at J-PARC K1.8 beamline.
We have obtained S/N = 17 and time resolution is 3.61ns which is sufficient for E03 experiment.
Summary
Hyperball-Ja new Ge detector array
Hyperball2 ( ε ~4 % for 1 MeV)can not be used @J-PARCdue to high count rate & radiation damage
→ Need new Ge detector array
Lower half of Hyperball-J
PWO counterGe detector
Pulse-tube cooler
Target
Features Radiation-hard Ge detector
→ Mechanical cooling
Fast background suppressor → PWO counter
Pulse-shape readout and analysis
Adjustable detector geometry
Large photo-peak efficiency → ε ~6.1 % @1 MeV with 32 Ge detectors
Remotely controlled and monitored